Boot-calk.



Nd. 892,173. PATENTBD JUNE 30, 1908.

- L. H. MAXWELL.

. BOOT GALK; APPLICATION TILED PEB- 8, 190'].

LEVI HENDRON MAXWELL, OF NEW BRITAIN, CONNECTICUT.

BOOT-CALK.

Application filed February 6, 1907.

Specification of Letters Patent.

Patented June 30, 1908.

Serial lNo. 356,074.

To all whom it may concern:

Be it known that I, LEVI IInNnnoN MAX- WELL, a citizen of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have invented a new and useful Boot-Calk, of which the following is a specification.

This invention relates to calks for heavy boots, and the like. Calks of this character have been made with a stop disk and a central spike, said disk being provided with radial strengthening ribs that rise above the base of the spike. These devices are ordi narily made very hard by case hardening, and the result has been that the ribs are liable to break off, particularly when the calks are being applied to the boot, inasmuch as the strain upon the ribs transmitted from the applying tool, is transversely of said ribs, which are comparatively thin. As a result, the calks are often thus damaged when the holding screws are but part-way in, and when such an accident happens, it is practically impossible to drive the screw home, and exceedingly difficult to remove the calk. Moreover, the arrangement of the parts is such that when the spike wears down to the ribs, the calk becomes practically useless, and if worn down to the base of the spike, the ribs are also worn so badly that is is difficult to remove the calk.

The aim of the present invention is to overcome both of these objections in boot calks, and to produce a calk that is neat in its appearance.

The preferred form of construction is shown in the accompanying drawings, where- 1n Figure 1 is a side elevation of the calk. Fig. 2 is a side elevation at right angles to Fig. 1. Fig. 3 is a bottom plan view. Fig. 4 is a sectional view. Fig. 5 is a detail sectional view, showing the spike worn to the disk. Fig. 6 is a detail sectional view, showing the calk in place in an applying tool.

' Similar reference numerals designate corresponding parts in all the figures of the drawings.

In the embodiment illustrated, the calk consists of a single piece of metal, and comrises a centrally disposed stop disk 7, one face 8 of which is convex, the other face being preferably flat. A holding screw stem 9 projects from the flat side while a tapered spike 10 projects centrally from the convex side. Projecting from said convex side are also a pair of diametrically opposite flanges 11, which are located along the outer margins of the face, and have their outer faces coincident with the edge of the disk 7, thus being curved to correspond substantially to the circumferential curve of the disk. The inner faces of the flanges are spaced from the spike, as clearly shown in Figs. 1 and 4. Moreover, the outer or free edges of the flanges are disposed approximately in a plane that intersects the base of the spike at its juncture with the convex face. The flanges moreover are so constructed that both ends of each constitute abutting shoulders for the tool. WVith this arrangement, it will be evident that when a tool, as 12, is applied to a calk, the calk can be turned in opposite directions by the engagement of the tool with the opposite shoulders formed by the ends of the flanges. The strain transmitted to the flanges 11 is longitudinally of said flanges, and as these flanges are comparatively long, the danger of breakage is eliminated. At the same time, the said flanges constitute material reinforcements for the edges of the disk. F urthcr than this, inasn'iuch as their free edges are substantially flush with the base of the spike, said spike can wear completely away or down to the disk without interference on the part of the flanges.

From the foregoing, it is thought that the construction, operation, and many advantages of the herein described invention, will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion, and minor details of construction, may be resorted towithout departing from the s )irit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. As an article of manufacture, a boot calk comprising a stop disk, a spike projecting from one face of the same, a threaded stem projecting from the opposite face, and elongated flanges projecting from the margins of the disk on the side having the spike, said flanges being disposed circumferentially along said margins and having their inner sides disposed in spaced relation to the spike, the ends of each flange forming shoulders outer face, a threaded stem projecting from the inner face, a spike projecting centrally from the convex outer face, and flanges proecting from the margins of said outer face and having their outer free edges disposee substantially in a plane that intersects the base of the spike at its uncture With the convex face of the disk," said flanges being spaced from the spike and from each other,

and both ends of each flange forming shoulders that are adapted to be engaged by a tool placed over the spike to rotate the calk in opposite directions. 3. As an article of manufacture, a boot 1 calk comprising a circular stop disk having a convex outer face, a threaded stein projecting from the inner face, a spike projecting centrally from the convex outer face, and elongated flanges projecting from the margins of said outer face and having their outer free edges disposed substantially in a plane t l1;a t intersects the base of the spike at its juncture With the convex face of the disk, said flanges being curved to conform to the circumferential curve of the disk and being disposed longitudinally thereof in spaced re lation to the spike, both ends of each flange forming shoulders that are adapted to be engaged by a tool placed over the spike to rotate the calk in opposite directions.

In testimony, that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of tWo Witnesses.

LEVI HENDRON MAXWELL.

' Vitnesses:

ERNEST B. WHEELER, VENTREs A. CLARK. 

